Happy Fathers Day!

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Across
  1. 1. You get one of these when finishing a PhD in Finland (5)
  2. 6. Donald _: Inventor of LaTeX (5)
  3. 7. English blue cheese (7)
  4. 9. Russian assassin in Skulduggery Pleasant: Mortal Coil (9)
  5. 10. Jon _: Discovered that cholera is waterborne (4)
  6. 12. Chicken Man toy collector in Toy Story 2 (3,2)
  7. 13. J.K. _: Omniman in Invincible and J. Jonah Jameson Jr. in Spiderman (7)
  8. 17. Controversial brewery (7)
  9. 19. _ point: Non-Hermitian degeneracy of both eigenvalues and eigenvectors (11)
  10. 23. Parry with a down-facing point (5)
  11. 24. Richard Dawkins, Stephen Hawking, and Noam Chomsky all knew this person [last name] (7)
  12. 25. Better understanding this will help with quantum computing applications (11)
  13. 26. David Mitchell's character in Ludwig (4)
  14. 27. _ van Rossum: Creator of Python (5)
  15. 28. Main character of The War Between the Land and the Sea (7)
Down
  1. 2. _ Smith: Main character in 1984 (7)
  2. 3. Gap in time where nothing happens (6)
  3. 4. Welsh Vineyard [your bday present] (5,6)
  4. 5. This day (7)
  5. 8. Claude 5 variant (5)
  6. 9. _ model: Method for expressing a differential equation on a lattice (5,7)
  7. 10. _ Oh: Kyle's PhD supervisor (4,4)
  8. 11. Manchester mayor known as "King in the North" (7)
  9. 14. _ful is bad but _some is great (3)
  10. 15. Rhun ap _: First Minister of Wales (7)
  11. 16. Jake's DnD location (7)
  12. 18. Does his own dentistry (8)
  13. 20. Cory is in the top 5% of players in this game (9)
  14. 21. Mozart's middle name (7)
  15. 22. Surbiton Wetherspoons (10,4)